EP 2829740 A1 20150128 - FLUSHING CIRCUIT FOR HYDRAULIC CYLINDER DRIVE CIRCUIT
Title (en)
FLUSHING CIRCUIT FOR HYDRAULIC CYLINDER DRIVE CIRCUIT
Title (de)
SPÜLKREISLAUF FÜR EINE HYDRAULIKZYLINDER-ANTRIEBSSCHALTUNG
Title (fr)
CIRCUIT DE RINÇAGE POUR CIRCUIT D'ENTRAÎNEMENT D'HUILE HYDRAULIQUE
Publication
Application
Priority
JP 2012057288 W 20120322
Abstract (en)
The present invention provides a flushing circuit for a hydraulic cylinder drive circuit, by which the flushing of the circuit is conducted while protecting precision apparatuses of a control valve unit, because the flushing of a reciprocating hydraulic cylinder and its drive circuit is conducted while bypassing the control valve unit. In a hydraulic oil supply/discharge circuit connecting a tank of hydraulic oil, a hydraulic pump generating pressurized hydraulic oil, and a hydraulic cylinder with one another, a control valve unit in which at least a direction switching valve is provided in the vicinity of the hydraulic pump and the oil tank and a multifunction valve having a bypass circuit in the vicinity of the hydraulic cylinder are provided, and a bypass circuit bypassing the control valve unit is provided to branch from a hydraulic oil supply/discharge circuit between the multifunction valve and the control valve unit. At the time of the flushing of the hydraulic cylinder and the hydraulic oil supply/discharge circuit, contaminated hydraulic oil returns the tank without passing through the control valve unit, with the result that the control valve unit is protected from the contaminated hydraulic oil.
IPC 8 full level
F15B 21/00 (2006.01); F15B 13/08 (2006.01); F15B 21/041 (2019.01)
CPC (source: EP US)
F15B 21/005 (2013.01 - EP US); F15B 21/041 (2013.01 - EP US); F16H 61/4043 (2013.01 - US); F16H 61/4104 (2013.01 - US); F15B 13/081 (2013.01 - EP US); F15B 2211/3058 (2013.01 - EP US); F15B 2211/3138 (2013.01 - EP US); F15B 2211/40515 (2013.01 - EP US); F15B 2211/40584 (2013.01 - EP US); F15B 2211/411 (2013.01 - EP US); F15B 2211/41527 (2013.01 - EP US); F15B 2211/41572 (2013.01 - EP US); F15B 2211/41581 (2013.01 - EP US); F15B 2211/611 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2829740 A1 20150128; EP 2829740 A4 20151223; EP 2829740 B1 20160928; CN 104204547 A 20141210; JP 6040981 B2 20161214; JP WO2013140561 A1 20150803; KR 20140136026 A 20141127; US 2015082784 A1 20150326; US 9429231 B2 20160830; WO 2013140561 A1 20130926
DOCDB simple family (application)
EP 12871667 A 20120322; CN 201280071680 A 20120322; JP 2012057288 W 20120322; JP 2014505890 A 20120322; KR 20147028216 A 20120322; US 201214387121 A 20120322